24 Aug
2014
24 Aug
'14
5:25 p.m.
On Sun, Aug 24, 2014 at 07:19:11AM -0700, Len Ovens wrote:
That is true and for most studio mics (anyone use
crystal mics?) it
would be minimal. Anytime eq is used to bring back low level
frequencies, it is likely to bring back the noise around that
frequency too. Instrument pickups are most sensitive to this. I have
a classical guitar that I put a piezo into.
Piezos have a capacitive impedance, together with the preamp resistive
input impedance this forms a first order highpass filter. A typical mic
input is around 2 kOhms, this would place the cutoff frequency somewhere
in the high audio range, with 6 dB/oct below that. Could be EQ'd in theory,
but for musical use it's usually better to use a high-Z preamp.
Some specialised preamps (e.g. for piezo hydrophones), actually do use
a 'zero impedance' input, and integrate the signal to compensate. This
provides the best FR and the most stable calibration, and allows the use
of very long cables..
Ciao,
--
FA
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It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)